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Takeoff problem with 737

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i have a huge takeoff Problem with the 737 NGX.


If I leave all values in FSACTIONS --> FUEL unchanged and only enter the ZFM and CG% with double LSK click on the PERF page later the plane takes off normally.


However as soon as I change the standard fuel setting to another value (lets say from pre-entered 21000 KGs to new value 20500 KGs) the plane takes off much ealier than expected. Usually around 110 knots far before V1 is announced.


Flaps is 5 or 15.


This Problem happens with correctly adjusted trim settings or without.


I hope you guys can help me...


Thx !


Regards Andi 








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